third_party/llvm-7.0/llvm/test/CodeGen/AArch64/arm64-bitfield-extract.ll

; RUN: opt -codegenprepare -mtriple=arm64-apple=ios -S -o - %s | FileCheck --check-prefix=OPT %s
; RUN: llc < %s -mtriple=arm64-eabi | FileCheck %s
%struct.X = type { i8, i8, [2 x i8] }
%struct.Y = type { i32, i8 }
%struct.Z = type { i8, i8, [2 x i8], i16 }
%struct.A = type { i64, i8 }

define void @foo(%struct.X* nocapture %x, %struct.Y* nocapture %y) nounwind optsize ssp {
; CHECK-LABEL: foo:
; CHECK: ubfx
; CHECK-NOT: and
; CHECK: ret

  %tmp = bitcast %struct.X* %x to i32*
  %tmp1 = load i32, i32* %tmp, align 4
  %b = getelementptr inbounds %struct.Y, %struct.Y* %y, i64 0, i32 1
  %bf.clear = lshr i32 %tmp1, 3
  %bf.clear.lobit = and i32 %bf.clear, 1
  %frombool = trunc i32 %bf.clear.lobit to i8
  store i8 %frombool, i8* %b, align 1
  ret void
}

define i32 @baz(i64 %cav1.coerce) nounwind {
; CHECK-LABEL: baz:
; CHECK: sbfx  w0, w0, #0, #4
  %tmp = trunc i64 %cav1.coerce to i32
  %tmp1 = shl i32 %tmp, 28
  %bf.val.sext = ashr exact i32 %tmp1, 28
  ret i32 %bf.val.sext
}

define i32 @bar(i64 %cav1.coerce) nounwind {
; CHECK-LABEL: bar:
; CHECK: sbfx  w0, w0, #4, #6
  %tmp = trunc i64 %cav1.coerce to i32
  %cav1.sroa.0.1.insert = shl i32 %tmp, 22
  %tmp1 = ashr i32 %cav1.sroa.0.1.insert, 26
  ret i32 %tmp1
}

define void @fct1(%struct.Z* nocapture %x, %struct.A* nocapture %y) nounwind optsize ssp {
; CHECK-LABEL: fct1:
; CHECK: ubfx x{{[0-9]+}}, x{{[0-9]+}}
; CHECK-NOT: and
; CHECK: ret

  %tmp = bitcast %struct.Z* %x to i64*
  %tmp1 = load i64, i64* %tmp, align 4
  %b = getelementptr inbounds %struct.A, %struct.A* %y, i64 0, i32 0
  %bf.clear = lshr i64 %tmp1, 3
  %bf.clear.lobit = and i64 %bf.clear, 1
  store i64 %bf.clear.lobit, i64* %b, align 8
  ret void
}

define i64 @fct2(i64 %cav1.coerce) nounwind {
; CHECK-LABEL: fct2:
; CHECK: sbfx  x0, x0, #0, #36
  %tmp = shl i64 %cav1.coerce, 28
  %bf.val.sext = ashr exact i64 %tmp, 28
  ret i64 %bf.val.sext
}

define i64 @fct3(i64 %cav1.coerce) nounwind {
; CHECK-LABEL: fct3:
; CHECK: sbfx  x0, x0, #4, #38
  %cav1.sroa.0.1.insert = shl i64 %cav1.coerce, 22
  %tmp1 = ashr i64 %cav1.sroa.0.1.insert, 26
  ret i64 %tmp1
}

define void @fct4(i64* nocapture %y, i64 %x) nounwind optsize inlinehint ssp {
entry:
; CHECK-LABEL: fct4:
; CHECK: ldr [[REG1:x[0-9]+]],
; CHECK-NEXT: bfxil [[REG1]], x1, #16, #24
; CHECK-NEXT: str [[REG1]],
; CHECK-NEXT: ret
  %0 = load i64, i64* %y, align 8
  %and = and i64 %0, -16777216
  %shr = lshr i64 %x, 16
  %and1 = and i64 %shr, 16777215
  %or = or i64 %and, %and1
  store i64 %or, i64* %y, align 8
  ret void
}

define void @fct5(i32* nocapture %y, i32 %x) nounwind optsize inlinehint ssp {
entry:
; CHECK-LABEL: fct5:
; CHECK: ldr [[REG1:w[0-9]+]],
; CHECK-NEXT: bfxil [[REG1]], w1, #16, #3
; CHECK-NEXT: str [[REG1]],
; CHECK-NEXT: ret
  %0 = load i32, i32* %y, align 8
  %and = and i32 %0, -8
  %shr = lshr i32 %x, 16
  %and1 = and i32 %shr, 7
  %or = or i32 %and, %and1
  store i32 %or, i32* %y, align 8
  ret void
}

; Check if we can still catch bfm instruction when we drop some low bits
define void @fct6(i32* nocapture %y, i32 %x) nounwind optsize inlinehint ssp {
entry:
; CHECK-LABEL: fct6:
; CHECK: ldr [[REG1:w[0-9]+]],
; CHECK-NEXT: bfxil [[REG1]], w1, #16, #3
; lsr is an alias of ubfm
; CHECK-NEXT: lsr [[REG2:w[0-9]+]], [[REG1]], #2
; CHECK-NEXT: str [[REG2]],
; CHECK-NEXT: ret
  %0 = load i32, i32* %y, align 8
  %and = and i32 %0, -8
  %shr = lshr i32 %x, 16
  %and1 = and i32 %shr, 7
  %or = or i32 %and, %and1
  %shr1 = lshr i32 %or, 2
  store i32 %shr1, i32* %y, align 8
  ret void
}


; Check if we can still catch bfm instruction when we drop some high bits
define void @fct7(i32* nocapture %y, i32 %x) nounwind optsize inlinehint ssp {
entry:
; CHECK-LABEL: fct7:
; CHECK: ldr [[REG1:w[0-9]+]],
; CHECK-NEXT: bfxil [[REG1]], w1, #16, #3
; lsl is an alias of ubfm
; CHECK-NEXT: lsl [[REG2:w[0-9]+]], [[REG1]], #2
; CHECK-NEXT: str [[REG2]],
; CHECK-NEXT: ret
  %0 = load i32, i32* %y, align 8
  %and = and i32 %0, -8
  %shr = lshr i32 %x, 16
  %and1 = and i32 %shr, 7
  %or = or i32 %and, %and1
  %shl = shl i32 %or, 2
  store i32 %shl, i32* %y, align 8
  ret void
}


; Check if we can still catch bfm instruction when we drop some low bits
; (i64 version)
define void @fct8(i64* nocapture %y, i64 %x) nounwind optsize inlinehint ssp {
entry:
; CHECK-LABEL: fct8:
; CHECK: ldr [[REG1:x[0-9]+]],
; CHECK-NEXT: bfxil [[REG1]], x1, #16, #3
; lsr is an alias of ubfm
; CHECK-NEXT: lsr [[REG2:x[0-9]+]], [[REG1]], #2
; CHECK-NEXT: str [[REG2]],
; CHECK-NEXT: ret
  %0 = load i64, i64* %y, align 8
  %and = and i64 %0, -8
  %shr = lshr i64 %x, 16
  %and1 = and i64 %shr, 7
  %or = or i64 %and, %and1
  %shr1 = lshr i64 %or, 2
  store i64 %shr1, i64* %y, align 8
  ret void
}


; Check if we can still catch bfm instruction when we drop some high bits
; (i64 version)
define void @fct9(i64* nocapture %y, i64 %x) nounwind optsize inlinehint ssp {
entry:
; CHECK-LABEL: fct9:
; CHECK: ldr [[REG1:x[0-9]+]],
; CHECK-NEXT: bfxil [[REG1]], x1, #16, #3
; lsr is an alias of ubfm
; CHECK-NEXT: lsl [[REG2:x[0-9]+]], [[REG1]], #2
; CHECK-NEXT: str [[REG2]],
; CHECK-NEXT: ret
  %0 = load i64, i64* %y, align 8
  %and = and i64 %0, -8
  %shr = lshr i64 %x, 16
  %and1 = and i64 %shr, 7
  %or = or i64 %and, %and1
  %shl = shl i64 %or, 2
  store i64 %shl, i64* %y, align 8
  ret void
}

; Check if we can catch bfm instruction when lsb is 0 (i.e., no lshr)
; (i32 version)
define void @fct10(i32* nocapture %y, i32 %x) nounwind optsize inlinehint ssp {
entry:
; CHECK-LABEL: fct10:
; CHECK: ldr [[REG1:w[0-9]+]],
; CHECK-NEXT: bfxil [[REG1]], w1, #0, #3
; lsl is an alias of ubfm
; CHECK-NEXT: lsl [[REG2:w[0-9]+]], [[REG1]], #2
; CHECK-NEXT: str [[REG2]],
; CHECK-NEXT: ret
  %0 = load i32, i32* %y, align 8
  %and = and i32 %0, -8
  %and1 = and i32 %x, 7
  %or = or i32 %and, %and1
  %shl = shl i32 %or, 2
  store i32 %shl, i32* %y, align 8
  ret void
}

; Check if we can catch bfm instruction when lsb is 0 (i.e., no lshr)
; (i64 version)
define void @fct11(i64* nocapture %y, i64 %x) nounwind optsize inlinehint ssp {
entry:
; CHECK-LABEL: fct11:
; CHECK: ldr [[REG1:x[0-9]+]],
; CHECK-NEXT: bfxil [[REG1]], x1, #0, #3
; lsl is an alias of ubfm
; CHECK-NEXT: lsl [[REG2:x[0-9]+]], [[REG1]], #2
; CHECK-NEXT: str [[REG2]],
; CHECK-NEXT: ret
  %0 = load i64, i64* %y, align 8
  %and = and i64 %0, -8
  %and1 = and i64 %x, 7
  %or = or i64 %and, %and1
  %shl = shl i64 %or, 2
  store i64 %shl, i64* %y, align 8
  ret void
}

define zeroext i1 @fct12bis(i32 %tmp2) unnamed_addr nounwind ssp align 2 {
; CHECK-LABEL: fct12bis:
; CHECK-NOT: and
; CHECK: ubfx w0, w0, #11, #1
  %and.i.i = and i32 %tmp2, 2048
  %tobool.i.i = icmp ne i32 %and.i.i, 0
  ret i1 %tobool.i.i
}

; Check if we can still catch bfm instruction when we drop some high bits
; and some low bits
define void @fct12(i32* nocapture %y, i32 %x) nounwind optsize inlinehint ssp {
entry:
; CHECK-LABEL: fct12:
; CHECK: ldr [[REG1:w[0-9]+]],
; CHECK-NEXT: bfxil [[REG1]], w1, #16, #3
; lsr is an alias of ubfm
; CHECK-NEXT: ubfx [[REG2:w[0-9]+]], [[REG1]], #2, #28
; CHECK-NEXT: str [[REG2]],
; CHECK-NEXT: ret
  %0 = load i32, i32* %y, align 8
  %and = and i32 %0, -8
  %shr = lshr i32 %x, 16
  %and1 = and i32 %shr, 7
  %or = or i32 %and, %and1
  %shl = shl i32 %or, 2
  %shr2 = lshr i32 %shl, 4
  store i32 %shr2, i32* %y, align 8
  ret void
}

; Check if we can still catch bfm instruction when we drop some high bits
; and some low bits
; (i64 version)
define void @fct13(i64* nocapture %y, i64 %x) nounwind optsize inlinehint ssp {
entry:
; CHECK-LABEL: fct13:
; CHECK: ldr [[REG1:x[0-9]+]],
; CHECK-NEXT: bfxil [[REG1]], x1, #16, #3
; lsr is an alias of ubfm
; CHECK-NEXT: ubfx [[REG2:x[0-9]+]], [[REG1]], #2, #60
; CHECK-NEXT: str [[REG2]],
; CHECK-NEXT: ret
  %0 = load i64, i64* %y, align 8
  %and = and i64 %0, -8
  %shr = lshr i64 %x, 16
  %and1 = and i64 %shr, 7
  %or = or i64 %and, %and1
  %shl = shl i64 %or, 2
  %shr2 = lshr i64 %shl, 4
  store i64 %shr2, i64* %y, align 8
  ret void
}


; Check if we can still catch bfm instruction when we drop some high bits
; and some low bits
define void @fct14(i32* nocapture %y, i32 %x, i32 %x1) nounwind optsize inlinehint ssp {
entry:
; CHECK-LABEL: fct14:
; CHECK: ldr [[REG1:w[0-9]+]],
; CHECK-NEXT: bfxil [[REG1]], w1, #16, #8
; lsr is an alias of ubfm
; CHECK-NEXT: lsr [[REG2:w[0-9]+]], [[REG1]], #4
; CHECK-NEXT: bfxil [[REG2]], w2, #5, #3
; lsl is an alias of ubfm
; CHECK-NEXT: lsl [[REG3:w[0-9]+]], [[REG2]], #2
; CHECK-NEXT: str [[REG3]],
; CHECK-NEXT: ret
  %0 = load i32, i32* %y, align 8
  %and = and i32 %0, -256
  %shr = lshr i32 %x, 16
  %and1 = and i32 %shr, 255
  %or = or i32 %and, %and1
  %shl = lshr i32 %or, 4
  %and2 = and i32 %shl, -8
  %shr1 = lshr i32 %x1, 5
  %and3 = and i32 %shr1, 7
  %or1 = or i32 %and2, %and3
  %shl1 = shl i32 %or1, 2
  store i32 %shl1, i32* %y, align 8
  ret void
}

; Check if we can still catch bfm instruction when we drop some high bits
; and some low bits
; (i64 version)
define void @fct15(i64* nocapture %y, i64 %x, i64 %x1) nounwind optsize inlinehint ssp {
entry:
; CHECK-LABEL: fct15:
; CHECK: ldr [[REG1:x[0-9]+]],
; CHECK-NEXT: bfxil [[REG1]], x1, #16, #8
; lsr is an alias of ubfm
; CHECK-NEXT: lsr [[REG2:x[0-9]+]], [[REG1]], #4
; CHECK-NEXT: bfxil [[REG2]], x2, #5, #3
; lsl is an alias of ubfm
; CHECK-NEXT: lsl [[REG3:x[0-9]+]], [[REG2]], #2
; CHECK-NEXT: str [[REG3]],
; CHECK-NEXT: ret
  %0 = load i64, i64* %y, align 8
  %and = and i64 %0, -256
  %shr = lshr i64 %x, 16
  %and1 = and i64 %shr, 255
  %or = or i64 %and, %and1
  %shl = lshr i64 %or, 4
  %and2 = and i64 %shl, -8
  %shr1 = lshr i64 %x1, 5
  %and3 = and i64 %shr1, 7
  %or1 = or i64 %and2, %and3
  %shl1 = shl i64 %or1, 2
  store i64 %shl1, i64* %y, align 8
  ret void
}

; Check if we can still catch bfm instruction when we drop some high bits
; and some low bits and a masking operation has to be kept
define void @fct16(i32* nocapture %y, i32 %x) nounwind optsize inlinehint ssp {
entry:
; CHECK-LABEL: fct16:
; CHECK: ldr [[REG1:w[0-9]+]],
; Create the constant
; CHECK: mov [[REGCST:w[0-9]+]], #33120
; CHECK: movk [[REGCST]], #26, lsl #16
; Do the masking
; CHECK: and [[REG2:w[0-9]+]], [[REG1]], [[REGCST]]
; CHECK-NEXT: bfxil [[REG2]], w1, #16, #3
; lsr is an alias of ubfm
; CHECK-NEXT: ubfx [[REG3:w[0-9]+]], [[REG2]], #2, #28
; CHECK-NEXT: str [[REG3]],
; CHECK-NEXT: ret
  %0 = load i32, i32* %y, align 8
  %and = and i32 %0, 1737056
  %shr = lshr i32 %x, 16
  %and1 = and i32 %shr, 7
  %or = or i32 %and, %and1
  %shl = shl i32 %or, 2
  %shr2 = lshr i32 %shl, 4
  store i32 %shr2, i32* %y, align 8
  ret void
}


; Check if we can still catch bfm instruction when we drop some high bits
; and some low bits and a masking operation has to be kept
; (i64 version)
define void @fct17(i64* nocapture %y, i64 %x) nounwind optsize inlinehint ssp {
entry:
; CHECK-LABEL: fct17:
; CHECK: ldr [[REG1:x[0-9]+]],
; Create the constant
; CHECK: mov w[[REGCST:[0-9]+]], #33120
; CHECK: movk w[[REGCST]], #26, lsl #16
; Do the masking
; CHECK: and [[REG2:x[0-9]+]], [[REG1]], x[[REGCST]]
; CHECK-NEXT: bfxil [[REG2]], x1, #16, #3
; lsr is an alias of ubfm
; CHECK-NEXT: ubfx [[REG3:x[0-9]+]], [[REG2]], #2, #60
; CHECK-NEXT: str [[REG3]],
; CHECK-NEXT: ret
  %0 = load i64, i64* %y, align 8
  %and = and i64 %0, 1737056
  %shr = lshr i64 %x, 16
  %and1 = and i64 %shr, 7
  %or = or i64 %and, %and1
  %shl = shl i64 %or, 2
  %shr2 = lshr i64 %shl, 4
  store i64 %shr2, i64* %y, align 8
  ret void
}

define i64 @fct18(i32 %xor72) nounwind ssp {
; CHECK-LABEL: fct18:
; CHECK: ubfx x0, x0, #9, #8
  %shr81 = lshr i32 %xor72, 9
  %conv82 = zext i32 %shr81 to i64
  %result = and i64 %conv82, 255
  ret i64 %result
}

; Using the access to the global array to keep the instruction and control flow.
@first_ones = external global [65536 x i8]

; Function Attrs: nounwind readonly ssp
define i32 @fct19(i64 %arg1) nounwind readonly ssp  {
; CHECK-LABEL: fct19:
entry:
  %x.sroa.1.0.extract.shift = lshr i64 %arg1, 16
  %x.sroa.1.0.extract.trunc = trunc i64 %x.sroa.1.0.extract.shift to i16
  %x.sroa.3.0.extract.shift = lshr i64 %arg1, 32
  %x.sroa.5.0.extract.shift = lshr i64 %arg1, 48
  %tobool = icmp eq i64 %x.sroa.5.0.extract.shift, 0
  br i1 %tobool, label %if.end, label %if.then

if.then:                                          ; preds = %entry
  %arrayidx3 = getelementptr inbounds [65536 x i8], [65536 x i8]* @first_ones, i64 0, i64 %x.sroa.5.0.extract.shift
  %0 = load i8, i8* %arrayidx3, align 1
  %conv = zext i8 %0 to i32
  br label %return

; OPT-LABEL: if.end
if.end:                                           ; preds = %entry
; OPT: lshr
; CHECK: ubfx	[[REG1:x[0-9]+]], [[REG2:x[0-9]+]], #32, #16
  %x.sroa.3.0.extract.trunc = trunc i64 %x.sroa.3.0.extract.shift to i16
  %tobool6 = icmp eq i16 %x.sroa.3.0.extract.trunc, 0
; CHECK: cbz
  br i1 %tobool6, label %if.end13, label %if.then7

; OPT-LABEL: if.then7
if.then7:                                         ; preds = %if.end
; OPT: lshr
; "and" should be combined to "ubfm" while "ubfm" should be removed by cse. 
; So neither of them should be in the assemble code. 
; CHECK-NOT: and
; CHECK-NOT: ubfm
  %idxprom10 = and i64 %x.sroa.3.0.extract.shift, 65535
  %arrayidx11 = getelementptr inbounds [65536 x i8], [65536 x i8]* @first_ones, i64 0, i64 %idxprom10
  %1 = load i8, i8* %arrayidx11, align 1
  %conv12 = zext i8 %1 to i32
  %add = add nsw i32 %conv12, 16
  br label %return

; OPT-LABEL: if.end13
if.end13:                                         ; preds = %if.end
; OPT: lshr
; OPT: trunc
; CHECK: ubfx	[[REG3:x[0-9]+]], [[REG4:x[0-9]+]], #16, #16
  %tobool16 = icmp eq i16 %x.sroa.1.0.extract.trunc, 0
; CHECK: cbz
  br i1 %tobool16, label %return, label %if.then17

; OPT-LABEL: if.then17
if.then17:                                        ; preds = %if.end13
; OPT: lshr
; "and" should be combined to "ubfm" while "ubfm" should be removed by cse. 
; So neither of them should be in the assemble code. 
; CHECK-NOT: and
; CHECK-NOT: ubfm
  %idxprom20 = and i64 %x.sroa.1.0.extract.shift, 65535
  %arrayidx21 = getelementptr inbounds [65536 x i8], [65536 x i8]* @first_ones, i64 0, i64 %idxprom20
  %2 = load i8, i8* %arrayidx21, align 1
  %conv22 = zext i8 %2 to i32
  %add23 = add nsw i32 %conv22, 32
  br label %return

return:                                           ; preds = %if.end13, %if.then17, %if.then7, %if.then
; CHECK: ret
  %retval.0 = phi i32 [ %conv, %if.then ], [ %add, %if.then7 ], [ %add23, %if.then17 ], [ 64, %if.end13 ]
  ret i32 %retval.0
}

; Make sure we do not assert if the immediate in and is bigger than i64.
; PR19503.
; OPT-LABEL: @fct20
; OPT: lshr
; OPT-NOT: lshr
; OPT: ret
; CHECK-LABEL: fct20:
; CHECK: ret
define i80 @fct20(i128 %a, i128 %b) {
entry:
  %shr = lshr i128 %a, 18
  %conv = trunc i128 %shr to i80
  %tobool = icmp eq i128 %b, 0
  br i1 %tobool, label %then, label %end
then:                     
  %and = and i128 %shr, 483673642326615442599424
  %conv2 = trunc i128 %and to i80
  br label %end
end:
  %conv3 = phi i80 [%conv, %entry], [%conv2, %then] 
  ret i80 %conv3
}

; Check if we can still catch UBFX when "AND" is used by SHL.
; CHECK-LABEL: fct21:
; CHECK: ubfx
@arr = external global [8 x [64 x i64]]
define i64 @fct21(i64 %x) {
entry:
  %shr = lshr i64 %x, 4
  %and = and i64 %shr, 15
  %arrayidx = getelementptr inbounds [8 x [64 x i64]], [8 x [64 x i64]]* @arr, i64 0, i64 0, i64 %and
  %0 = load i64, i64* %arrayidx, align 8
  ret i64 %0
}

define i16 @test_ignored_rightbits(i32 %dst, i32 %in) {
; CHECK-LABEL: test_ignored_rightbits:

  %positioned_field = shl i32 %in, 3
  %positioned_masked_field = and i32 %positioned_field, 120
  %masked_dst = and i32 %dst, 7
  %insertion = or i32 %masked_dst, %positioned_masked_field
; CHECK: {{bfm|bfi|bfxil}}

  %shl16 = shl i32 %insertion, 8
  %or18 = or i32 %shl16, %insertion
  %conv19 = trunc i32 %or18 to i16
; CHECK: bfi {{w[0-9]+}}, {{w[0-9]+}}, #8, #7

  ret i16 %conv19
}

; The following test excercises the case where we have a BFI
; instruction with the same input in both operands. We need to
; track the useful bits through both operands.
; CHECK-LABEL: sameOperandBFI
; CHECK: lsr
; CHECK: and
; CHECK: bfi
; CHECK: bfi
define void @sameOperandBFI(i64 %src, i64 %src2, i16 *%ptr) {
entry:
  %shr47 = lshr i64 %src, 47
  %src2.trunc = trunc i64 %src2 to i32
  br i1 undef, label %end, label %if.else

if.else:
  %and3 = and i32 %src2.trunc, 3
  %shl2 = shl nuw nsw i64 %shr47, 2
  %shl2.trunc = trunc i64 %shl2 to i32
  %and12 = and i32 %shl2.trunc, 12
  %BFISource = or i32 %and3, %and12         ; ...00000ABCD
  %BFIRHS = shl nuw nsw i32 %BFISource, 4   ; ...0ABCD0000
  %BFI = or i32 %BFIRHS, %BFISource         ; ...0ABCDABCD
  %BFItrunc = trunc i32 %BFI to i16
  store i16 %BFItrunc, i16* %ptr, align 4
  br label %end

end:
  ret void
}